[PATCH 8/8] drm/amd/display: copy function name into dcn_optc_lock_unlock_state trace event

[Melissa Wen <mwen@igalia.com>]

Userspace trace tools that use libtraceevent to read binary buffer only
see a kernel address when printing const char *. Use string macros in
dcn_optc_lock_unlock_state to copy the function name into the trace
event.

Fixes: f1943a51f0f9 ("drm/amd/display: Add events log to trace OPTC lock and unlock")
Assisted-by: Claude:claude-opus-5-5
Signed-off-by: Melissa Wen <mwen@igalia.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_trace.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_trace.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_trace.h
index b2f38654e489..7f05f73e5b33 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_trace.h
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_trace.h
@@ -660,7 +660,7 @@ TRACE_EVENT(dcn_optc_lock_unlock_state,
 	    TP_ARGS(optc_state, instance, lock, function, line),
 
 	    TP_STRUCT__entry(
-			     __field(const char *, function)
+			     __string(function, function)
 			     __field(int, instance)
 			     __field(bool, lock)
 			     __field(int, line)
@@ -678,7 +678,7 @@ TRACE_EVENT(dcn_optc_lock_unlock_state,
 			     __field(int, vready_offset)
 	    ),
 	    TP_fast_assign(
-			   __entry->function = function;
+			   __assign_str(function);
 			   __entry->instance = instance;
 			   __entry->lock = lock;
 			   __entry->line = line;
@@ -700,7 +700,7 @@ TRACE_EVENT(dcn_optc_lock_unlock_state,
 		      "min_v_blank_interlace=%d vstartup_start=%d vupdate_offset=%d vupdate_width=%d "
 		      "vready_offset=%d",
 		      __entry->lock ? "Lock" : "Unlock",
-		      __entry->function,
+		      __get_str(function),
 		      __entry->line,
 		      __entry->instance,
 		      __entry->opp_count,
-- 
2.53.0